Friction-transfer test for the assessment of in situ strength and adhesion of cementitious materials |
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| Affiliation: | 1. University of California Merced, School of Engineering, University of California, Merced, CA 95343, United States;2. Iowa State University, Department of Mechanical Engineering, Iowa State University, Ames, IA 50011, United States;1. Laboratory L2MGC, University of Cergy-Pontoise, F9500 Cergy-Pontoise, France;2. VINCI Construction, 61, Avenue Jules-Quentin, 92730 Nanterre, France;3. Civil Engineering Laboratory, University of Amar Telidji, 03000 Laghouat, Algeria;1. Clinical Physiology and Nuclear Medicine Unit, Department of Clinical Sciences, Lund University, Malmö, Sweden;2. Department of Thoracic Surgery, Skåne University Hospital, Lund University, Lund, Sweden;3. Biomedical Engineering, Faculty of Engineering, LTH, Lund University, Lund, Sweden;4. Information Engineering Department, University of Florence, Florence, Italy;1. Department of Cellular & Integrative Physiology, Indiana University School of Medicine, 635 Barnhill Dr., Indianapolis, IN 46202, USA;2. College of Pharmacy & Health Sciences, Butler University, 4600 Sunset Ave., Indianapolis, IN 46208, USA;3. Covance, Inc., 671 South Meridian Road, Greenfield, IN 46140, USA |
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| Abstract: | Since in concrete industry, the quality control is generally accomplished by the testing of separately prepared samples, the accurate estimate of the in situ strength of concrete has become a necessity. The main discrepancies between the measured cube strength and the actual in situ strength of concrete, relates to their different conditions associated with the development of strength. In addition, due to chemical deterioration or damage, accurate estimate of in situ concrete strength provides valuable information about the present situation of the structure, when making decisions about the required repair and/or strengthening systems. The Friction-Transfer method, which is described in this paper, can be used to estimate the in situ strength of concrete and other materials. In this method a specially devised apparatus fits on to the top of the partial core and is clamped to it. To measure the concrete compressive strength, a torque is applied using an ordinary torque-meter and the maximum shear stress at failure is used to estimate the cube compressive strength by means of a calibration graph. In order to measure the adhesion between different layers of cementitious and/or resinous materials, their torsional shear strengths are calculated along the failed inter-facial surfaces of the layers. Laboratory and in situ tests, to evaluate the performance of the method are described. Also in view of the accurate and reliable results attainable, some specific applications are proposed. |
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